Model Railroader – September 2019

September 2019 45

leads from the lightboards through the hole and under the lay-
out, where I connected them to a 5VDC power supply.
To limit current through the LEDs, which have a forward
voltage drop of 3V, I placed 460Ω resistors between the +5V
supply and the red wires from the LEDs.
You can adjust the brightness of the LEDs by using different
resistors. However, too much current can damage the LEDs, so
don’t use less than 100Ω resistors.

Light-emitting-diode backlight modules proved an inex-

pensive and easy solution for illuminating low-relief structures.

I plan on adding them to the neighboring background build-

ing on my N scale model railroad.

Mike Hardwick is an engineering manager in the San

Francisco Bay area who currently models the N scale Western

Pacific RR San Jose Branch in the early 1960s.

Positive leads

separate

Negative leads connected Heat-shrink tubing

Tape holds wires

to ABS

(^1) ⁄ 4 " hole
❺ Running the leads. Mike soldered 2-foot lengths of
stranded wire to the LED leads, using red wire for positive and
black wire for negative. He covered the joints with heat-shrink
tubing and taped the wires to the ABS sheet.
❻ A hole through the backdrop. Mike drilled a^1 ⁄ 4 " hole
through the backdrop for the LED leads. He routed the wires
under the layout and placed 460Ω resistors between a +5VDC
power supply and the positive lead wires.
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